Hi, Would someone be able to let me know if the following part numbers (115 350 1220, 115 350 3320, and 123 350 6220 with its ratio of 1:4.08) are the right differential for my W114, e230, 6 cylinders, Twin carburetor, Manual transmission, 1972? As for its Manual transmission, I like to know if the following part number 115 260 4201 belongs to my car. By the way, the chassis number of my car is 114.015-10- 110470.